"Twitter 'SHADOW BANNING' prominent Republicans. Not good. We will look into this discriminatory and illegal practice at once!" Trump wrote in a Twitter post.

File image of US President Donald Trump.

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Washington: President Donald Trump accused Twitter Inc on Thursday of restricting the visibility of prominent U.S. Republicans, without providing evidence, and the avid user of the social media platform promised to investigate.

Trump accused the company of targeting fellow Republicans with a practice dubbed "shadow banning," limiting the visibility of a Twitter user including in the platform's auto-populated dropdown search box. Twitter denied "shadow banning" anyone.

Twitter shares, already lower in pre-market trading after Facebook Inc's disappointing earnings late on Wednesday dampened enthusiasm for technology and social media stocks, were down around 3 percent on Thursday morning.

"Twitter 'SHADOW BANNING' prominent Republicans. Not good. We will look into this discriminatory and illegal practice at once!" Trump wrote in a Twitter post.

Heading to Dubuque, Iowa and then Granite City, Illinois. Looking forward to being with many great friends!

It was not clear whether Trump planned to ask federal regulators to investigate. The White House did not respond to a request for comment.

Twitter did not comment directly on Trump's tweet but said in a statement it does not "shadow ban."

"We are aware that some accounts are not automatically populating in our search box, and we're shipping a change to address this," it said.

Twitter added that the technology used is based on user behavior, not political views.

Trump is a high-profile and frequent user of Twitter, offering opinions, announcing policies and often attacking adversaries. But some Trump supporters have been saying for months that Republican and conservative candidates are being stifled on social media.

Trump's tweet followed a Vice news report on Wednesday that Republican National Committee Chairwoman Ronna McDaniel and other Republicans including the president's son Donald Trump Jr.'s spokesman were being "shadow banned."

"The notion that social media companies would suppress certain political points of view should concern every American. Twitter owes the public answers to what's really going on," McDaniel wrote on Twitter.

Twitter instituted a policy change on July 12 to increase the service's credibility and reduce suspected fraud. That change cost its 100 most popular users about 2 percent of their followers, on average, according to social media data firm Keyhole.

The change, former example, cost Democratic former President Barack Obama 2 million followers by the morning after the change and singers Katy Perry and Justin Bieber each lost 3 million, the Washington Post reported, citing analytics company Twitter Counter. The report said Trump's account lost more than 200,000 of its 53 million followers.

Republican U.S. Representative Matt Gaetz blamed changes in Twitter policies for a drop in his following.

"Our office is aware of claims that Twitter has discriminated against multiple accounts maintained by Congressman Gaetz. We are investigating the depths and impact of these serious charges," his office said in a statement.

At a hearing last week before the House of Representatives Judiciary Committee, Facebook, Google parent company Alphabet Inc and Twitter said they did not discriminate against content for political reasons.

Twitter's senior strategist Nick Pickles testified that the company does not discriminate against conservatives and works to make neutral decisions. "Our purpose is to serve the conversation, not to make value judgments on personal beliefs," Pickles said.